Using neuroimaging to examine cognitive function in twins, results show that their brain functioning is more similar than that of non-twin siblings. Based on Genetic contribution to variation in cognitive function: An fMRI study in twins, Koten et al, Science, 2009. This short documentary is a strong entry in the Gene Screen BC 2010 science video contest. Winner will be announced Sept. 8. Pubcast DOI: 10.4016/20743.01.